JPH1046793A - Water absorbing quantity - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve moisture absorptivity of a 'tatami', and prevent dew condensation by specifying a driving quantity of rushes, and arranging a water absorptive sheet on an under surface of a 'tatami facing'. SOLUTION: A cushion material 3 is arranged on an under surface of a core material 2, and a water absorptive sheet 4 is arranged on an upper surface, and a 'tatami facing' is fixed to the uppermost surface. An imitation rush constituted so that a tape-like body composed of thermoplastic resin drawn in the lengthwise direction is irregularly converged and formed by being passed through into a heating member to form a narrow void, and a fused coating film is formed on a surface, is used as a rush 5 for a 'tatami facing'. A driving quantity of rushes 5 is set to 120 to 40 pieces per a warp directional length 10cm when a rush diameter is regarded as 1mm. Upper moisture easily permeates downward from a 'tatami facing' large in an interval between the rushes 5, and since the permeated moisture is immediately absorbed by a lower water absorptive sheet, dew condensation can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a water absorption tatami mat.

[0002]

2. Description of the Related Art Tatami naturally has a water absorbing ability, and has a capability of breathing moisture. Therefore, dew condensation on the surface has hardly occurred. However, modern homes are highly airtight and easily condensed in the home or on the surface of furniture, and tatami mats are no exception. As the tatami mats, artificial products, that is, floor mats and tatami mats made of synthetic resin have been used, and there are various problems because they do not have the moisture absorption and water absorption functions of natural materials.

[0003]

In many cases, a futon, a mattress, and the like are laid on the surface of a tatami mat, and a human sleeps on the futon and the mattress.
In this case, moisture in the futon or the mattress is almost saturated due to humidity in the room and sweat diverted by humans. In such a case, the temperature is relatively high because the room is heated in winter, but the temperature is low under the floor, and the tatami surface becomes low. At this time, when the surface of the tatami mat has no or little hygroscopicity, dew forms on the surface. Of course, there is a possibility that dew condensation may occur even on a natural rush table depending on the usage.

[0004] When such dew condensation occurs, the tatami mats, futons and the like may be damaged, and if they become severe, mold may grow.

[0005] Such dew condensation is particularly remarkable in thin tatami mats that have been frequently used recently because of their small heat insulating effect.

[0006]

In view of the above situation, the present inventor has completed the present invention as a result of intensive studies and is characterized by the fact that the amount of driving of the rush is reduced. 120 per 10 cm with a diameter of 1 mm
１４０140, and a water absorbing sheet is provided on the lower surface of the tatami mat.

Here, the rush may be natural rush which has been used since ancient times or imitation rush manufactured from plastic or the like. What is necessary is just to be able to weave as a tatami table. Above all, imitation rushes that have been devised and patented by the applicant are preferred. In this method, a tape-like body made of a thermoplastic resin stretched in the longitudinal direction was passed through a heating member forming a narrow gap, irregularly convergently formed, and a fused film was formed on the surface. Things.

In one example of the method for producing the imitation rush, a raw material tape from an inflation device is drawn by a first pinch roll while passing through a first heating device, and is introduced into a second heating device. Irregular convergence by the second heating device. This is pulled by a second pinch roll and sent to a subsequent cutting step. If it is cut to a predetermined length in the cutting step, the process is completed. This imitation rush is woven and tatami mat like natural rush.

[0009] Here, the thermoplastic resin means a resin whose viscosity can be reduced by heating to make it moldable. Polyolefin such as polypropylene is a typical example, but is not particularly limited. Of course, a mixture of various thermoplastic resins may be used. To this, a weathering agent, a pigment, a matting agent and the like which are usually mixed may be mixed. Stretching may be performed by a usual method, and the magnification is about 2 to 7 times.

[0010] The tape-shaped body may be manufactured in any manner, but it is preferable to use a tubular body formed by inflation processing, which is folded as it is, and cut into an appropriate width for use. . A plurality of such tapes having an appropriate width are combined and passed through a heating unit to form one imitation rush. The thickness of the tape is about 0.005 to 0.05 mm, and the cutting width is several mm to about 20 to 50 mm.

Although not essential, the tape-shaped body may be provided with a number of uneven wrinkles. The uneven wrinkles are wrinkles like waves that exist parallel to the longitudinal direction of the tape-shaped body, and do not need to be regular. Such wrinkles enable the imitation rush to absorb so-called stiffness and water and the like during the so-called strain, so that water absorption can be imparted.

The term "narrow space" means that the space is narrower than a state in which the tape is simply converged, and is usually about 1.0 to 1.5 mm. This value is determined by the diameter of the finished imitation rush, and is about 1 mm in the case of producing a product close to a natural rush.

The heating member may be one in which the narrow space itself is electrically heated like a heater, or a heating member may be present around the narrow space. The irregular convergence means that the tape-shaped body is not regularly folded or rolled up, but is randomly wrinkled to form a cylindrical body having a tape-shaped body therein. Steps other than the above essential steps may be added, or other control equipment may be used. Further, the above steps may be performed in a single step, or may be performed in two steps or the like. That is, it is a method of winding and storing once at an intermediate stage, and introducing the stored product to the next step.

Examples of the steps other than the above essential steps include:
There are a cooling step and a heating step after convergence. The cooling step is usually air cooling, in which only cooling air is sent, but may be water cooling. Alternatively, a method of simply leaving it alone may be used. The next heating step is 80-100 ° C.
Heating is good, and methods such as passing through hot water or sprinkling hot water are suitable. Of course, you may heat with steam.

[0015] As a method of forming irregularities on the surface of the finished imitation rush, a simple method of passing the same through a roller having a groove is simple. Then, a number of small projections are provided inside the groove. When passing through this groove, a small hole is formed by the projection. This may be carried out continuously with the production before the imitation rush is cooled, or may be carried out while heating again as a separate step after it is completely cooled. Of course, if the projection is sharp like a needle, it is possible without heating.

The method of providing the unevenness is not limited to this, and any method may be used. For example, the rush is pressed and rotated on a flat plate having a large number of irregularities. In addition, it may be performed one by one or many at the same time. That is, it is made to pass through a roll having a large number of grooves to simultaneously form the irregularities.

The following numerical values are important for imitation rushes, ie for approximating natural rushes (although it is not necessary to do so, of course). Product diameter,
Filling rate, film thickness, width of each tape. Here, the filling factor is obtained by dividing the cross-sectional area of the film itself by the cross-sectional area of the finished rush, and is the ratio of the film to the cross-section of the rush.

According to experiments performed by the inventors, the following numerical values were found to be preferable in order to make the imitation rush closer to a natural product. The diameter of the product is 1.0mm ~ 3.0mm The filling factor is 50 ~ 90% The film thickness is 5 ~ 50μ Of course, it is not an essential requirement to fall within this range, meaning that products close to natural products can be manufactured. Yes, it is not necessary to fall into this range if you do not care about similarities with natural products.

The tatami mat is made by weaving the above-mentioned imitation rush, and the weave may be of any kind.
Not only the method currently woven with natural rush but also a completely new weave.

The driving amount is the degree of density when weaving the rush, and is expressed by the number per 10 cm in the warp direction. In the present invention, the number is 120 to 140. Since the number of regular tatami mats is 150 to 160, the amount is very small in the present invention. This is to reduce the amount of rush and allow moisture to penetrate the gaps. Water penetrates through very small voids due to its small size, but in the case of tatami, the rushes are not only in contact but also intricate, so there is almost no permeability.

The amount of driving differs depending on the thickness of the rush. In the present invention, the diameter of the rush is 120 to 140 when the diameter is 1 mm, and if the diameter is different, it may be converted by the ratio. For example, if the diameter becomes 1.5 times,
The number of shots may be reduced to 1 / 1.5.

The water-absorbing sheet may be any sheet as long as it has a water-absorbing property. For example, it may be paper or nonwoven fabric. A sheet such as a sponge or a sheet containing a water-absorbing substance such as silica gel may be used. This is attached to the back of the tatami mat. The thickness of the water-absorbing sheet is 0.1 to 1.0 mm
A degree is sufficient. Moisture that has permeated through the gap between the rushes is immediately absorbed and adsorbed by the water-absorbing sheet, and there is no risk of dew condensation on the tatami mat surface.

The thickness of the tatami mat of the present invention may be a normal one of about 55 mm or a so-called thin tatami mat. In the case of thin tatami, 10
The thickness is about 25 mm. That is, the thickness is not limited. This thin tatami mat is called a barrier-free, and a construction method that does not provide a step in a room has been recommended and has been used frequently. This is because even the slightest step may cause the elderly and the disabled to trip over. In the conventional architectural style, floor boards are laid on joists, and 55 mm tatami mats are laid thereon. A threshold is provided at the same level as the upper surface of the tatami mat. Therefore, in a room of a corridor or a flooring, since the thickness of the plate material is about 10 mm, a difference between the room and the threshold (the same thickness as the tatami mat) becomes a step.

The structure of the thin tatami mat may be a normal one, but a structure using aluminum veneer is also preferable. This is made by attaching aluminum to both sides of a plywood. The thickness of the aluminum sheet is not particularly limited.
It is preferably 0.5 mm, and the surface may be subjected to rust prevention such as painting. This aluminum sheet has moisture,
It serves to prevent moisture from entering the substrate. The plywood refers to a thin plate made of timber, which is bonded to a plurality of sheets with the fiber direction at right angles. The thickness is not particularly limited, but is preferably about 1 to 10 mm.

As the water-absorbing tatami of the present invention, the number of rushes to be driven is small, and a water-absorbing sheet may be provided on the lower surface thereof, and any other components may be used. That is, the present invention includes a member included in a general tatami mat or a so-called thin tatami mat, or a member additionally provided thereto.

[0026]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in more detail with reference to embodiments shown in the drawings. FIG. 1 shows one embodiment of the absorbent tatami mat 1 of the present invention.
It is sectional drawing which shows an example. A cushion material 3 is provided on the lower surface of the core material 2, and a water absorbing sheet 4 is provided on the upper surface. And the tatami mat is fixed on the top surface. Here, aluminum veneer was used as the core material 2, polyester non-woven fabric was used as the cushion material, and the same water absorbing sheet was used. Aluminum veneer is obtained by attaching aluminum foil to both sides of a 10 mm veneer plate.

Regarding the amount of the extruder 5, which is one of the features of the present invention, the interval of the extruder 5 is indicated by L in the figure.
In fact, it looks almost the same. However, there is a large difference in the dew condensation due to the difference in the number of lines.

In this example, as the rug 5 for the tatami table,
By passing a tape-shaped body made of a thermoplastic resin stretched in the longitudinal direction through a heating member forming a narrow gap, an irregular convergence formation and an imitation rusher 5 having a fusion-bonded film formed on the surface are formed. Is used. Even with such a plastic, there is a gap between the rushes, and the moisture that enters between them is absorbed by the nonwoven fabric. In the inventors' experiments, no dew condensation was seen.

[0029]

The present invention described in detail above has the following significant effects. Due to the large rush interval of the tatami mat, the water above easily penetrates downward. Since the water-absorbing sheet is provided below, the permeated moisture is immediately absorbed and there is no condensation. When the cushion sheet is provided on the back surface, the cushion is good and the walking feeling is good. Due to the large rush interval of the tatami mat, the permeated moisture is released faster due to changes in indoor humidity.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional view showing an example of a water absorption tatami of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Water absorption tatami 2 Core material 3 Cushion material 4 Water absorption sheet 5 Igusa

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Naoaki Miyamoto 2-1-1 Dojimahama, Kita-ku, Osaka

Claims (3)

[Claims] 1. The amount of driving of the rush is 1 m in the rush diameter.
A water-absorbent tatami mat having 120 to 140 per 10 cm as m and a water-absorbing sheet provided on the lower surface of the tatami mat surface. 2. A tape-shaped body made of a thermoplastic resin in which the rusher is stretched in the longitudinal direction is passed through a heating member forming a narrow gap, thereby converging and forming irregularly and fused to the surface. The water absorption tatami according to claim 1, which is an imitation rush having a film formed thereon. 3. The water-absorbent tatami mat according to claim 2, wherein the floor material below the tatami mat front and the water-absorbent sheet is fixed to a plywood covered with an aluminum sheet on both front and rear sides to reduce the overall thickness to 25 mm or less.